Maintenance, that will be tit. You can still change a top, or bottom end, but the electronics will be like OBD1 or 2 (if the feds have their way). All you need is a scan tool if the check engine light came on. I don't understand way people are scared shitless of all the electronics and wiring. Well then again I was a mechanic working on cars, and I hated how stupid engineers placed their engines and covered them with 10 lbs of damn plastic. <---- This is the reason I don't work on cars as a mechanic, but back to the subject. I'm so used to electronics that I am not afraid of wiring running there and here, and changing an ecu is easier than changing jets. Hell, If you can hack the ecu, all ya need to do is start pushing keys on a keyboard.<----- This isn't for the beginner or novice, you can and will blow the motor up if you don't have a clue what the hell your doing. That's your own risk, so you have been warned! Yes I have seen some ecu's crap out, but it happens, so buy a new one. Also some of the electronics and sensors will shit the bed, but technology has come a long way.
Now weight. Will it weigh more? Sure it will but not by much, this just means you'll just have to find ways to lose the 2 pounds (if that) that were added to the bike. Oh yea, it'll still weigh less than the lead sleds. Like TMKIWI said a few pages back, your taking all the electronics off the the carb bike and then putting the EFI, DI on. Last time I checked spark advance is run by a....... you guessed it a CDI box, which is......... do I have to say it again ELECTRONICS!! Also the 02+ CR250 has a stepper motor to run the power valve, do I have to say what that is? Oh wait a second, KTM's 250GP racer had an injector of some sort (not sure if it was an injector or a solenoid built into the carb) for high rpm and over rev fuelling along with the CDI and stepper motor.
It looks like to me, TMKIWI knows his shit about DI 2 strokes. He has experience in this field as I have experience with EFI and cars. And he is right, so I have to give him credit for putting up with some of you and your dinos
. I also have to thank 2smoker for sticking up for the DI 2 stroke. It's the future and should have been years ago, and it's going to happen no matter what anyone thinks. So stock up on carbs and CDI boxes. J/K
PS. I'm not pissed off at the nay sayers I'm just trying to get the point across. There's always two sides to a story and always will be. I hope I didn't offend anyone. Thanks